Nothing you can do. Did you efile 2021 using 0 for the AGI? That works for most people.
The IRS sent out a lot of letters. The last couple years were a mess and the IRS got way behind processing returns.
IRS suspending notices
IRS continues work to help taxpayers; suspends mailing of additional letters | Internal Revenue Serv...
See this CNN article requesting another copy
IRS to temporarily stop sending many taxpayer notices - CNN
